Preheat your oven to 350°F (180°C) and line two baking sheets with parchment paper.

In a medium bowl, sift together flour, baking soda, and salt.

In a stand mixer, beat together butter, granulated sugar, and powdered sugar until creamy.

Add the egg and vanilla extract, mixing until just combined.

Gradually add the dry ingredients to the wet mixture, mixing until combined.

Fold in sprinkles gently.

Scoop dough into balls and place on prepared baking sheets, spaced 2 inches apart.

Bake for 11-12 minutes until edges are just golden.

Cool on baking sheets for 5-10 minutes, then transfer to a wire rack.